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-rw-r--r--tests/bugs/write-behind/issue-884.c267
1 files changed, 267 insertions, 0 deletions
diff --git a/tests/bugs/write-behind/issue-884.c b/tests/bugs/write-behind/issue-884.c
new file mode 100644
index 0000000..e9c33b3
--- /dev/null
+++ b/tests/bugs/write-behind/issue-884.c
@@ -0,0 +1,267 @@
+
+#define _GNU_SOURCE
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <time.h>
+#include <assert.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <pthread.h>
+
+#include <glusterfs/api/glfs.h>
+
+/* Based on a reproducer by Stefan Ring. It seems to be quite sensible to any
+ * timing modification, so the code has been maintained as is, only with minor
+ * changes. */
+
+struct glfs *glfs;
+
+pthread_mutex_t the_mutex = PTHREAD_MUTEX_INITIALIZER;
+pthread_cond_t the_cond = PTHREAD_COND_INITIALIZER;
+
+typedef struct _my_aiocb {
+ int64_t size;
+ volatile int64_t seq;
+ int which;
+} my_aiocb;
+
+typedef struct _worker_data {
+ my_aiocb cb;
+ struct iovec iov;
+ int64_t offset;
+} worker_data;
+
+typedef struct {
+ worker_data wdata[2];
+
+ volatile unsigned busy;
+} all_data_t;
+
+all_data_t all_data;
+
+static void
+completion_fnc(struct glfs_fd *fd, ssize_t ret, struct glfs_stat *pre,
+ struct glfs_stat *post, void *arg)
+{
+ void *the_thread;
+ my_aiocb *cb = (my_aiocb *)arg;
+ long seq = cb->seq;
+
+ assert(ret == cb->size);
+
+ pthread_mutex_lock(&the_mutex);
+ pthread_cond_broadcast(&the_cond);
+
+ all_data.busy &= ~(1 << cb->which);
+ cb->seq = -1;
+
+ the_thread = (void *)pthread_self();
+ printf("worker %d is done from thread %p, seq %ld!\n", cb->which,
+ the_thread, seq);
+
+ pthread_mutex_unlock(&the_mutex);
+}
+
+static void
+init_wdata(worker_data *data, int which)
+{
+ data->cb.which = which;
+ data->cb.seq = -1;
+
+ data->iov.iov_base = malloc(1024 * 1024);
+ memset(data->iov.iov_base, 6,
+ 1024 * 1024); /* tail part never overwritten */
+}
+
+static void
+init()
+{
+ all_data.busy = 0;
+
+ init_wdata(&all_data.wdata[0], 0);
+ init_wdata(&all_data.wdata[1], 1);
+}
+
+static void
+do_write(struct glfs_fd *fd, int content, int size, int64_t seq,
+ worker_data *wdata, const char *name)
+{
+ int ret;
+
+ wdata->cb.size = size;
+ wdata->cb.seq = seq;
+
+ if (content >= 0)
+ memset(wdata->iov.iov_base, content, size);
+ wdata->iov.iov_len = size;
+
+ pthread_mutex_lock(&the_mutex);
+ printf("(%d) dispatching write \"%s\", offset %lx, len %x, seq %ld\n",
+ wdata->cb.which, name, (long)wdata->offset, size, (long)seq);
+ pthread_mutex_unlock(&the_mutex);
+ ret = glfs_pwritev_async(fd, &wdata->iov, 1, wdata->offset, 0,
+ completion_fnc, &wdata->cb);
+ assert(ret >= 0);
+}
+
+#define IDLE 0 // both workers must be idle
+#define ANY 1 // use any worker, other one may be busy
+
+int
+get_worker(int waitfor, int64_t excl_seq)
+{
+ int which;
+
+ pthread_mutex_lock(&the_mutex);
+
+ while (waitfor == IDLE && (all_data.busy & 3) != 0 ||
+ waitfor == ANY &&
+ ((all_data.busy & 3) == 3 ||
+ excl_seq >= 0 && (all_data.wdata[0].cb.seq == excl_seq ||
+ all_data.wdata[1].cb.seq == excl_seq)))
+ pthread_cond_wait(&the_cond, &the_mutex);
+
+ if (!(all_data.busy & 1))
+ which = 0;
+ else
+ which = 1;
+
+ all_data.busy |= (1 << which);
+
+ pthread_mutex_unlock(&the_mutex);
+
+ return which;
+}
+
+static int
+doit(struct glfs_fd *fd)
+{
+ int ret;
+ int64_t seq = 0;
+ int64_t offset = 0; // position in file, in blocks
+ int64_t base = 0x1000; // where to place the data, in blocks
+
+ int async_mode = ANY;
+
+ init();
+
+ for (;;) {
+ int which;
+ worker_data *wdata;
+
+ // for growing to the first offset
+ for (;;) {
+ int gap = base + 0x42 - offset;
+ if (!gap)
+ break;
+ if (gap > 80)
+ gap = 80;
+
+ which = get_worker(IDLE, -1);
+ wdata = &all_data.wdata[which];
+
+ wdata->offset = offset << 9;
+ do_write(fd, 0, gap << 9, seq++, wdata, "gap-filling");
+
+ offset += gap;
+ }
+
+ // 8700
+ which = get_worker(IDLE, -1);
+ wdata = &all_data.wdata[which];
+
+ wdata->offset = (base + 0x42) << 9;
+ do_write(fd, 1, 62 << 9, seq++, wdata, "!8700");
+
+ // 8701
+ which = get_worker(IDLE, -1);
+ wdata = &all_data.wdata[which];
+
+ wdata->offset = (base + 0x42) << 9;
+ do_write(fd, 2, 55 << 9, seq++, wdata, "!8701");
+
+ // 8702
+ which = get_worker(async_mode, -1);
+ wdata = &all_data.wdata[which];
+
+ wdata->offset = (base + 0x79) << 9;
+ do_write(fd, 3, 54 << 9, seq++, wdata, "!8702");
+
+ // 8703
+ which = get_worker(async_mode, -1);
+ wdata = &all_data.wdata[which];
+
+ wdata->offset = (base + 0xaf) << 9;
+ do_write(fd, 4, 81 << 9, seq++, wdata, "!8703");
+
+ // 8704
+ // this writes both 5s and 6s
+ // the range of 5s is the one that overwrites 8703
+
+ which = get_worker(async_mode, seq - 1);
+ wdata = &all_data.wdata[which];
+
+ memset(wdata->iov.iov_base, 5, 81 << 9);
+ wdata->offset = (base + 0xaf) << 9;
+ do_write(fd, -1, 1623 << 9, seq++, wdata, "!8704");
+
+ offset = base + 0x706;
+ base += 0x1000;
+ if (base >= 0x100000)
+ break;
+ }
+
+ printf("done!\n");
+ fflush(stdout);
+
+ pthread_mutex_lock(&the_mutex);
+
+ while ((all_data.busy & 3) != 0)
+ pthread_cond_wait(&the_cond, &the_mutex);
+
+ pthread_mutex_unlock(&the_mutex);
+
+ ret = glfs_close(fd);
+ assert(ret >= 0);
+ /*
+ ret = glfs_fini(glfs);
+ assert(ret >= 0);
+ */
+ return 0;
+}
+
+int
+main(int argc, char *argv[])
+{
+ int ret;
+ int open_flags = O_RDWR | O_DIRECT | O_TRUNC;
+ struct glfs_fd *fd;
+
+ glfs = glfs_new(argv[1]);
+ if (!glfs) {
+ printf("glfs_new!\n");
+ goto out;
+ }
+ ret = glfs_set_volfile_server(glfs, "tcp", "localhost", 24007);
+ if (ret < 0) {
+ printf("set_volfile!\n");
+ goto out;
+ }
+ ret = glfs_init(glfs);
+ if (ret) {
+ printf("init!\n");
+ goto out;
+ }
+ fd = glfs_open(glfs, argv[2], open_flags);
+ if (!fd) {
+ printf("open!\n");
+ goto out;
+ }
+ srand(time(NULL));
+ return doit(fd);
+out:
+ return 1;
+}